What methods can you use to improve database query performance?

To improve query performance in a database using Go, the following methods can be employed:

• Indexing: creating indexes on frequently used fields in WHERE or JOIN conditions.
• Prepared statements: allow reusing queries with different parameters, reducing overhead.
• Pagination: limiting the number of returned records using LIMIT and OFFSET.
• Caching: storing results of frequently executed queries in memory (e.g., using Redis or built-in cache).
• Query optimization: analyzing and rewriting SQL queries to reduce the number of operations and data volume.
• Connection pooling: to reduce the cost of establishing database connections.

Example of using a prepared statement in Go with the database/sql package:

stmt, err := db.Prepare("SELECT name FROM users WHERE age > ?")
if err != nil {
    log.Fatal(err)
}
rows, err := stmt.Query(30)
// process rows

These methods can help reduce response time and database load.